diff --git a/legacy/firmware/protob/messages-ethereum.options b/legacy/firmware/protob/messages-ethereum.options
index cebf7c1cb5..b499dd83cc 100644
--- a/legacy/firmware/protob/messages-ethereum.options
+++ b/legacy/firmware/protob/messages-ethereum.options
@@ -50,4 +50,5 @@ EthereumGetPublicKey.address_n          max_count:8
 
 EthereumAddress._old_address            max_size:20
 EthereumAddress.address                 max_size:43
+EthereumAddress.mac                     type:FT_IGNORE
 EthereumPublicKey.xpub                  max_size:113